plus, the deadline looms for the fiscal cliff. why some insiders think a deal will >>> president obama and senate leaders tomorrow head back to washington to try to reach a last minute deal, before historic tax increases go into effect next week. why some believe we will head over the fiscal cliff before washington takes action. >> reporter: the halls of power empty, although negotiators and the president are back at work. >> at the very least, let's agree right now on what we already agree on. >> reporter: an olive branch to the gop, and carrot to corporate giants. the administration now suggesting cutting corporate tax rates. the u.s. has among the world's highest. but closing loopholes that helped google, for instance, avoid $2 billion in taxes last year. >> corporations are a little concerned. >> reporter: gary is optimistic about a deal. >> i'd still rate it better than 50/50. >> reporter: what seems increasingly likely is to allow the country to go over that fiscal cliff, triggering higher taxes. that would allow hard line r